20605312008 has 60 divisors (see below), whose sum is σ = 57724189215. Its totient is φ = 6867219312.

The previous prime is 20605312003. The next prime is 20605312163. The reversal of 20605312008 is 80021350602.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

20605312008 is a `hidden beast` number, since 2 + 0 + 605 + 31 + 20 + 0 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10302656004 + 10302656004 = 101502^2 + 101502^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20605312003) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3651253 + ... + 3656891.

Almost surely, 2^20605312008 is an apocalyptic number.

It is an amenable number.

20605312008 is an abundant number, since it is smaller than the sum of its proper divisors (37118877207).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20605312008 is an frugal number, since it uses more digits than its factorization.

20605312008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11296 (or 5644 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The spelling of 20605312008 in words is "twenty billion, six hundred five million, three hundred twelve thousand, eight".